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Quantifying Gauche Defects and Phase Evolution in Self-Assembled Monolayers through Sessile Drops.

Jiahao Chen1,2,3, Boyce Chang1,2, Stephanie Oyola-Reynoso1

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Summary
This summary is machine-generated.

Self-assembled monolayers (SAMs) exhibit an odd-even effect in properties dependent on chain length. This study reveals the origin of this effect through wetting behavior, linking it to molecular conformations and defects in SAMs.

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Area of Science:

  • Surface Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Self-assembled monolayers (SAMs) are crucial for surface modification, with properties often influenced by molecular chain length.
  • The odd-even effect in linear alkanethiolate SAMs is a known phenomenon, but its origins related to structure and defects remain unclear.
  • Understanding chain-length-dependent properties is essential for designing functionalized surfaces.

Purpose of the Study:

  • To investigate the origin of chain-length-dependent properties, specifically the odd-even effect, in n-alkanethiolate SAMs.
  • To correlate wetting behavior with molecular conformations and defect evolution within SAMs.
  • To develop a new parameter to quantify these chain-length-dependent structural changes.

Main Methods:

  • Formation of n-alkanethiolate SAMs on ultraflat gold and silver surfaces.
  • Wetting experiments using polar (water) and nonpolar (hexadecane) solvents.
  • Analysis of wetting behavior to infer structural properties and defect evolution.
  • Redefinition of the Young-Dupre equation to introduce a dimensionless number (χ) characterizing molecular conformations.

Main Results:

  • The odd-even effect in hydrophobicity was observed for longer-chain SAMs (>C8).
  • Wetting behavior revealed three distinct transitions in SAM structure across different thiol chain lengths.
  • A new dimensionless number (χ) was defined, correlating with gauche defects and molecular conformations.
  • The study identified dynamic SAM behavior attributed to gauche defect evolution and packing density changes.

Conclusions:

  • Wetting behavior provides a sensitive method to probe chain-length-dependent gauche defects in SAMs.
  • The odd-even effect's origin is linked to molecular conformations and associated relaxations of bound thiolates.
  • The newly defined dimensionless number (χ) effectively parameterizes these conformational changes and surface energy evolution.